SSLv3 (POODLE) Scanning Project

If you are looking at this page, then more than likely, you noticed a scan coming from this server across your network and/or poking at your web server on port 443/tcp.

The scan that you saw is part of an effort by The Shadowserver Foundation to identify hosts that allow the use of SSL v3.0 with cipher-block chaining (CBC) mode ciphers which are vulnerable to the POODLE (Padding Oracle On Downgraded Legacy Encryption) attack (please see US-CERT alert TA14-290A at: https://www.us-cert.gov/ncas/alerts/TA14-290A for more information) and report them back to the network owners for remediation.

Servers that are configured this way have been incorporated into our reports and are being reported on a daily basis.

Methodology

We are querying all computers with routable IPv4 addresses that are not firewalled from the internet on port 443/tcp, attempting to establish an SSL connection with that host and capturing the response. We intend no harm, but if we are causing problems, please contact us at dnsscan [at] shadowserver [dot] org

If you would like to test your own device to see if it supports SSLv3, use the command: "openssl s_client -connect [IP]:443 -ssl3" from a linux device.

Whitelisting

To be removed from this set of scanning you will need to send an email to dnsscan [at] shadowserver [dot] org with the specific CIDR's that you would like to have removed. You will have to be the verifiable owner of these CIDR's and be able to prove that fact. Any address space that is whitelisted will be publicly available here: https://poodlescan.shadowserver.org/exclude.html